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The creation of particles by two colliding strong laser beams is considered.It is found that the electron-positron pairs created in the laser field via theSchwinger mechanism may recollide after one or several oscillations in thefield. Their collision can take place at high energy, which the pair gains fromthe field. As a result, high energy gamma quanta can be created by inelasticscattering or annihilation of the pair. Moreover, heavy particles such as muonpairs may also be created via the annihilation $e^+ + e^-\rightarrow \mu^+ +\mu^- $. The probability of $e^-e^+$ collision is greatly enhanced due to astrong alignment of the electron and positron momenta with the electric field.The found muon creation rate exponentially exceeds the rate predicted by thedirect Schwinger mechanism for muons, while the photon creation rateexponentially exceeds photon emission due to the fermion oscillation.

Enhanced creation of high energy particles in colliding laser beams